See https://people.kernel.org/monsieuricon/creepy-crawlies which describes how the https://git.kernel.org gets hammered by crawlers all the time even though you could run a single `git clone` and get the data that way instead.
For somebody who knows a bit how things are set up, or is willing to spend 10 minutes researching, it's a no-brainer that you can just "git clone" entire linux kernel development history, or download entire wikipedia [0].
Alas, large number of scrapers are not willing to spend those 10 minutes, it would appear. So, here we are.
It's also possible to request the docs already processed into markdown[1]. Lastly, basically all of the docs come from Git. A smart scraper could just clone a project's repo.
[1] https://docs.readthedocs.com/platform/stable/reference/markd...